In △ ABC, if the lengths of its three sides are 9, 12 and 15 respectively, then the area of the rectangle formed by two such triangles is______ .
∵ in △ ABC, the lengths of the three sides are 9, 12 and 15 respectively, 92 + 122 = 152, ∵ ABC is a right triangle, ∵ the area of the rectangle formed by two such triangles is 2 × 12 × 9 × 12 = 108; so the answer is: 108
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